// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_EVENTS_GESTURE_DETECTION_UI_MOTION_EVENT_H_
#define UI_EVENTS_GESTURE_DETECTION_UI_MOTION_EVENT_H_

#include <stddef.h>

#include <map>

#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/time/time.h"
#include "ui/events/event.h"
#include "ui/events/events_export.h"
#include "ui/events/gesture_detection/motion_event_generic.h"

namespace ui {

// Implementation of MotionEvent which takes a stream of ui::TouchEvents.
class EVENTS_EXPORT MotionEventAura : public MotionEventGeneric {
public:
    MotionEventAura();
    ~MotionEventAura() override;

    // MotionEventGeneric:
    int GetSourceDeviceId(size_t pointer_index) const override;

    // Returns true iff the touch was valid.
    bool OnTouch(const TouchEvent& touch);

    // We can't cleanup removed touch points immediately upon receipt of a
    // TouchCancel or TouchRelease, as the MotionEvent needs to be able to report
    // information about those touch events. Once the MotionEvent has been
    // processed, we call CleanupRemovedTouchPoints to do the required
    // book-keeping.
    void CleanupRemovedTouchPoints(const TouchEvent& event);

private:
    bool AddTouch(const TouchEvent& touch);
    void UpdateTouch(const TouchEvent& touch);
    void UpdateCachedAction(const TouchEvent& touch);
    int GetIndexFromId(int id) const;

    DISALLOW_COPY_AND_ASSIGN(MotionEventAura);
};

} // namespace ui

#endif // UI_EVENTS_GESTURE_DETECTION_UI_MOTION_EVENT_H_
